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My initial encounter with filters, convolution and correlation in OpenCV made me play around with the filters for Gaussian smooth, erosion and dilation operations on random image files. However I found the experience rather unsatisfactory and I wanted to get a real feel for the working of these operations. Suddenly a thought struck me. Could I restore an old family photograph of my parents? The photograph has areas of white patches that had to be removed. So I started to dig a little more into the filters, convolution and correlation matrices... [More]